JP2002234167A - Structure for bonding and fixing thin plate-shaped part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ink from leaking from a nozzle of an ink jet printer head. SOLUTION: Many recessed escape portion 58 for excessive adhesive are set at intervals to be tightly arranged to a first region surrounding an array of nozzles 54 of a bonding region 43a between a manifold plate 12 of a front face of a head unit 6 and a nozzle plate. On the other hand, many recessed escape portion 59 for excessive adhesive are set at intervals to be thinly arranged to the outside of the first region. The manifold plate 12 and the nozzle plate are bonded after an adhesive is applied to the bonding region 43a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for bonding and fixing a plurality of thin plates used for an ink jet printer head of a piezoelectric type or the like and electronic parts.

[0002]

2. Description of the Related Art A prior art ink jet printer head of an on-demand type, for example, is disclosed in
JP-A-78560 discloses a method of forming a row of nozzles for discharging ink in order to prevent the inkjet head from being distorted and cracking due to the stress caused by shrinkage during curing of the adhesive, thereby causing deterioration in durability and reliability. A nozzle plate (orifice plate) having a nozzle body and an ink passage communicating with the nozzle and a head body provided with an ink passage, for example, an island-shaped uneven portion is formed on the back surface of the nozzle plate, and the nozzle plate is connected to the nozzle plate via an adhesive. A configuration in which a head main body is joined is disclosed.

[0003]

However, since the number of island-shaped protrusions formed on the bonding surface of the above structure is small,
Conversely, since the entire area of the concave portion is increased, the area of the adhesive portion having a large adhesive layer thickness is increased, the amount of the adhesive used is increased, and the average value of the adhesive layer thickness is increased. Thus, there is a problem that the bonding strength is hardly improved because the bonding area does not increase so much.

[0004] In particular, since the island-shaped projections are only formed in a row at a constant interval in a region surrounding the row of nozzles, the adhesive strength in that area is not improved, and the area from the nozzle is not improved. There is a problem that ink easily leaks to the head body side having the piezoelectric actuator.

[0005] Such a problem has also occurred in the structure of bonding and fixing a thin plate used for other kinds of electronic parts and the like.

An object of the present invention is to solve these problems, and in particular, it is an object of the present invention to provide an ink jet printer head having improved adhesive strength.

[0007]

In order to achieve the above technical object, according to the first aspect of the present invention, a liquid flow path having a small diameter penetrating each thin plate is formed, and each liquid flow path is formed by a thin plate. The surfaces of at least two thin plates in a state where they communicate with each other,
In the bonding and fixing structure of a thin plate-shaped component bonded and fixed via an adhesive, a concave or through-hole shaped adhesive escape is provided on an outer peripheral region surrounding the liquid flow path on a surface of the one thin plate to be bonded. A large number of portions are formed, and in an outer peripheral region surrounding the liquid flow path, in a first area close to the liquid flow path, the arrangement intervals of the adhesive release sections are made dense, and a first area outside the first area is closed. It is characterized in that the arrangement intervals of the adhesive release portions in the two regions are reduced.

[0008] The invention described in claim 2 is the first invention.
In the adhesive fixing structure of a thin plate-shaped component according to the above, the thin plate-shaped component is a head unit plate of an inkjet printer having a plurality of nozzles arranged in a row on the front surface, wherein the liquid flow path is a nozzle plate And an ink passage formed in a counterpart plate to which the nozzle plate is bonded and fixed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1, 2 and 3 are perspective views of a piezoelectric ink jet printer head according to an embodiment of the present invention, FIG. 5 is a front view of the head unit, and FIG. 7 is adhesion of the bottom plate to the head unit and the protective cover plate. FIG. 11 is a sectional view of a main part showing a completed state, FIG. 11 is a perspective view of each part of a cavity plate as a head unit, and FIG.
FIG. 13A is an enlarged cross-sectional view of a main part showing a bonding state of a nozzle plate, and FIG. 13B is an enlarged cross-sectional view of an adhesive release portion.

As shown in FIGS. 1 to 7, an ink jet printer head according to the present invention has a main body frame 1 made of an injection-molded product made of a synthetic resin material such as polypropylene and polypropylene, and a lower surface of a bottom plate 5 thereof. It has two head units 6, 6 provided, and opening windows 57, 57 for exposing a nozzle row on the surface of each head unit 6, and is provided on the surface of the head units 6, 6 and the main body frame 1. It is composed of a fixed protective cover plate 44.

The main body frame 1 is formed in a substantially box shape with an open top, and has a mounting portion 3 from which the four ink cartridges 2 serving as ink supply sources can be detachably mounted. The ink supply passages 4 a, 4 b, 4 c, 4 d which can be connected to the ink discharge portions (not shown) of the ink cartridges 2 communicate with the lower surface of the bottom plate 5 of the main body frame 1.

The bottom plate 5 is formed horizontally so as to protrude downward from the mounting portion 3 by one step. On the lower surface side of the bottom plate 5, two head units 6, which will be described in detail later, are arranged in parallel. Two supporting portions 8 for contact are formed in a stepped shape. As shown in FIGS. 4 and 9, the ink supply passages 4a, 4b, 4c, 4
Openings 50, 50, 50, 50 corresponding to “d” are provided, and a substantially annular fitting groove 46 is formed so as to surround the outer periphery of each opening 50.

A ring-shaped packing 47 made of soft rubber or the like and having good sealing properties is fitted into each of the fitting grooves 46 (see FIGS. 2 and 9).

Each of the supporting portions 8 of the bottom plate 5 has
A plurality of pouring holes 9a and 9b of the UV adhesive 7 as a fast-curing first adhesive are formed so as to penetrate vertically. UV adhesive 7 supplied from pouring holes 9a, 9b
The head unit 6 and the nozzle plate 43 on the front surface thereof
Except that the protective cover plate 44 is fixed.

When the head unit 6 is fixed to each of the stepped support portions 8, 8, an appropriate clearance space 9 is provided between the head unit 6 and the flexible flat cable 40 on the back surface thereof.
c is formed.

Then, as shown in FIGS. 2, 6, and 7,
The plurality of pouring holes 9a and 9b are formed at locations where the side portions near the four corners of the head unit 6 are fixed to one head unit 6, and in the embodiment, among the two supporting portions 8 and 8, At locations where one side (the long side in the embodiment) is adjacent, the pouring holes 9a, 9a are formed so as to be exposed across the rear surfaces of the two head units 6, 6 arranged in parallel and the rear surface of the protective cover plate 44. Form wide.

A packing 53 (see FIG. 3) made of rubber or the like is provided on the upper surface of the one side portion 3a of the mounting portion 3 so as to be in close contact with the ink discharging portion.

Next, the structure of the front surface of the head unit 6 will be described with reference to FIG. 2, FIG. 5, FIG. 11, FIG.
As shown in FIG. 3A, a thin plate-like nozzle plate 43 made of synthetic resin or the like having a row of nozzles 54 is provided with an adhesive 5 at the center of the front surface (lower surface) of the cavity plate 10.
5 (see FIG. 13A).
As described later, there are 75 nozzles 54 in one row,
They are arranged in a staggered array (see FIGS. 11 and 12), and eject ink downward (see FIG. 14). A known water-repellent film is formed on the front surface of the nozzle plate 43.

On the other hand, a protective cover plate 44 for protecting the front sides of the two head units 6, 6 is made of a thin metal plate, and is provided on the outer peripheral edge of the nozzle plate 43 in each head unit 6. Two opening windows 57 are formed by press working so as to surround an appropriate gap size (see FIGS. 2 and 3). The protective cover plate 44 surrounds the outer peripheral portion of each of the opening windows 57 with respect to the front surface (lower surface) of the head unit 6 and a second adhesive 56 such as silicone having ink sealing properties (see FIGS. 7) is adhered and fixed (attached) in a liquid-sealed state. It is desirable that the protective cover plate 44 be slightly thicker than the nozzle plate 43.

In this case, on the front surface of each of the head units 6 (the front surface of the manifold plate 12) or the back surface of the protective cover plate 44, a portion closer to the outer periphery than the outer periphery of each of the opening windows 57 is provided. , 9b
A recess groove 60 for damping the second adhesive 56 so that the second adhesive 56 does not mix with the first adhesive 7 is formed on the inner peripheral side of the position 1. In the embodiment, as shown in FIG. 5, on the front surface of the lower manifold plate 12 in the head unit 6, outside the area 43a to which the nozzle plate 43 is bonded, and the row of the nozzles 54 in the nozzle plate 43, It is formed long along the row of the through passages 17.

As shown in FIGS. 5 and 13 (a), a front surface of the lower manifold plate 12 is
A large number of concave adhesive escape portions 58 and 59 having a circular shape in plan view are formed in the region 43a in a scattered manner. In that case, the diameter of the adhesive escape portion 58 in the first region near the row of the nozzles 54 is about 0.15 mm in the embodiment, slightly larger than the diameter of the nozzle 54 (about 0.025 mm in the embodiment), and The arrangement interval (pitch) of the adhesive release portions 58 is about 0.25 mm in the embodiment and is made dense. Incidentally, the arrangement interval (pitch) of the nozzles 54 in the embodiment is
It is about 0.34mm.

On the other hand, the diameter of the adhesive escape portion 59 in the second region outside the first region is 0.2 m in the embodiment.
m, which is set to be slightly larger than the diameter of the adhesive release portion 58 in the first region. The arrangement interval (pitch) of the adhesive release portions 59 is 0.5 mm in the embodiment.
Be sparse with the degree.

When the adhesive 55 (see FIG. 13A) applied to the area 43a including the first area and the second area is extended by the pressing force with the nozzle plate 43, the adhesive releasing section An excess of the adhesive 55 can escape into the spaces 58 and 59 (see FIG. 13B).

When the adhesive 55 wets the peripheral wall surfaces of the adhesive release portions 58 and 59 and then solidifies, the adhesive area of the adhesive 55 increases from the flat surface of the region 43a and the adhesive 55 The agent 55 solidifies on the peripheral wall surfaces of the adhesive release portions 58 and 59 (the region 43).
This has the effect that the adhesive strength can be increased by the anchoring effect (action) of (due to the adhesive curing with the plane intersecting the plane a).

Further, by setting the area where the adhesive release portions 58 are arranged at a close interval to a close area surrounding the row of the nozzles 54, there is no insufficient sealing due to the adhesive 55 in this area. It is possible to reliably prevent ink discharged from the nozzle plate 43 from entering the inside of the cavity plate 10 through the gap between the nozzle plate 43 and the surface of the mating member (the manifold plate 12).

The nozzle plate 43 is fixed to the front surface of the lower manifold plate 12 in the region 43a before and after the row of the through passages 17 by adhesive bonding. Positioning holes 61a and 62a are formed in the bottom surface of the main body frame 1 for bonding and fixing them in parallel. This positioning hole 61
The positions a and 62a coincide with the positioning holes 61 and 62 in the nozzle plate 43 in FIG.

Next, a method of fixing the head unit 6 and the protective cover plate 44 to the main body frame 1 will be described. The protective cover plate 44 made of a thin metal plate having openings 57 and 57 is positioned. Is applied on a jig 63 (see two points in FIG. 7), and a second adhesive 56 is applied so as to surround the outer peripheral portion of each of the opening windows 57 on the back surface of the protective cover plate 44. (See FIG. 6).

Next, the positioning holes 61 and 62 of the nozzle plate 43 are fitted to two positioning pins 64 (only one is shown in FIG. 7) of the jig 63, and the two nozzle plates 43 are The head units 6 and 6 are arranged so as to be exposed, and the intervals between the rows of nozzles 54 in both head units 6 and 6 are set so as to be constant and parallel, and the front surface of each head unit 6 and the back surface of the protective cover plate 44 are The second adhesive 56 is used for bonding and fixing. The main body frame 1 is put on them, and the head units 6, 6 are made to correspond to the positions of the support portions 8, 8, and the UV adhesive 7 as the first adhesive is poured into the pouring holes 9a, 9b. To cure the adhesive and fix the positions of the two head units 6, 6 at once.

In this way, as shown in FIG. 7, the second adhesive 56 is spread in a thin layer between the front surface of the manifold plate 12 and the back surface of the protective cover plate 44 by the pressing force. In addition, it is dammed at a plurality of locations of the pool grooves 60, and it becomes more difficult to leak in the outer peripheral direction. On the other hand, the UV adhesive 7, which is the first adhesive, also travels along the side edge from the back surface of each head unit 6, passes through the gap with the back surface of the protective cover plate 44, and flows in the inner circumferential direction of the opening window 57. However, the UV adhesive 7 hardly flows due to instantaneous solidification. Even if it flows in the inner circumferential direction of the opening window 57, if the plurality of pool grooves 60 are formed, the first
The occurrence of a place where the adhesive 7 and the second adhesive 56 are mixed can be reliably prevented.

By mixing different kinds of adhesives,
The solidification phenomenon does not occur, and an uncured portion is generated, whereby an accident such as an electrical short circuit due to ink leakage (leakage) can be prevented beforehand and reliably.

By arranging the pouring holes 9a and 9b near, for example, four corners of the head unit 6 having a rectangular shape in a plan view, when the UV adhesive 7 is solidified, the head unit 6 is caused by shrinkage distortion of the adhesive. Can be minimized. As shown in FIGS. 4 and 5, when the pouring hole 9a is formed to have a wide width across the adjacent side of the head units 6, 6 arranged in parallel, the UV adhesive 7 is applied to one pouring hole 9a. Fill with UV irradiation,
The two units 6, 6 can be solidified at once, which contributes to shortening of the working time and significant improvement of the manufacturing efficiency.

Further, by solidifying the vicinity of the four corners of the head unit 6, a head cap 6 made of rubber or the like for preventing the nozzle portion from drying when the ink jet head is not used while the ink jet head is mounted on the printer later. There is an advantage that when the front surface of the cavity plate 10 is pressed closely, deformation such that the plane of the cavity plate 10 is distorted hardly occurs.

Further, as shown in FIGS. 8 and 9, a sealant 45 is applied between the outer periphery of the protective cover plate 44 and the main body frame 1. In addition, between the flexible flat cable 40 and the main body frame 1, between the flexible flat cable 40 and the protective cover plate 44, and between the corner of the bent portion 44b of the protective cover plate 44 and the main body frame 1, Head unit 6
Before covering the main body frame 1 with the sealant 45, the sealant 45 is applied in advance. This completely seals the piezoelectric actuator and the electrical connection of the head unit 6 from the outside, and prevents ink, paper powder, dust and the like from entering from the outside.

Next, the head unit 6 and its components will be described in detail. The head unit 6 is shown in FIG.
As shown in FIG. 0 to FIG. 12, a laminated cavity plate 10 made of a plurality of metal plates,
0 or an adhesive or an adhesive sheet 41 (see FIG. 14)
A piezoelectric actuator 20 of a plate type, which is adhered and laminated via a substrate, and a flexible flat cable 40 are formed on the upper surface thereof for electrical connection with an external device.

As will be described later, the head unit 6
A filter 29 for removing dust in the ink supplied from the ink cartridge 3 above the supply hole 19a formed on one end of the uppermost base plate 14 is provided on the back side of the base plate 14 in advance. It is fixed with an adhesive (see FIGS. 10 and 11). When the cavity plate 10 is assembled to the main body frame 1, the supply holes 19a contact the periphery of the supply holes 19a with the packing 47 and the ink supply passages 4a.
Communicate with

The cavity plate 10 is shown in FIG.
And FIG. That is, the two manifold plates 12 and the spacer plate 13
And four thin metal plates of the base plate 14 are overlapped and bonded with an adhesive. In the embodiment, each plate except the nozzle plate 43 is made of a 42% nickel alloy steel plate and has a thickness of about 50 μm to 150 μm. Having

A nozzle plate 43 is adhered to the lower manifold plate 12, and a number of through passages 17 communicating with the nozzles 54 are formed in the upper and lower manifold plates 12.
The spacers 13 are provided at a constant pitch in a two-row staggered arrangement along the first direction (long side direction) of each of the spacer plates 13. Then, the two manifold plates 12
, Ink passages 12a and 12b are formed so as to extend along both sides of the row of the through holes 17. However,
Ink passage 1 in lower manifold plate 12
The recess 2b is formed to be open only on the upper side of the manifold plate 12 (see FIG. 12). The ink passages 12a and 12b are configured to be sealed by stacking the spacer plate 13 on the upper manifold plate 12.

The base plate 14 has a large number of narrow pressure chambers 16 extending in a second direction (short side direction) orthogonal to a center line along the long side (the first direction). Are drilled. When the longitudinal reference lines 14a and 14b are set in parallel on both the left and right sides of the center line, the tip 16a of the pressure chamber 16 on the left side of the center line is located on the left longitudinal reference line 14a, Conversely, the tip 16a of the pressure chamber 16 on the right side of the longitudinal center line is located on the right longitudinal reference line 14b.
6 are alternately arranged, so that the pressure chambers 16 on the left and right sides are alternately arranged so as to extend every other direction in opposite directions.

The front ends 16a of the pressure chambers 16 are connected to the through-holes 17, 1 formed in the spacer plate 13 and the two manifold plates 12 in the same staggered arrangement.
It communicates via 7,17. On the other hand, each of the pressure chambers 1
6, the other end 16b of the spacer plate 13 is provided with ink passages 12a in both manifold plates 12 through through holes 18 formed in both right and left portions of the spacer plate 13.
12b. The other end 16b of each pressure chamber 16
12 and 14, the base plate 14
Are formed so as to be opened only on the lower surface side of.

Thus, the base plate 14
And a supply hole 19 formed at one end of the spacer plate 13.
The ink flowing into the ink passages 12a and 12b from the ink passages 12a and 12b is distributed from the ink passages 12a to the pressure chambers 16 through the through holes 18 and then from the pressure chambers 16 to the ink passages 12a and 12b. It is configured to pass through the passages 17, 17, 17 and reach the nozzle 54 corresponding to the pressure chamber 16 (see FIG. 14).

On the other hand, as shown in FIG. 14, the piezoelectric actuator 20 has a structure in which a plurality of piezoelectric sheets 21 are laminated, and as described in Japanese Patent Application Laid-Open No. 4-341851, Lowermost piezoelectric sheet 2
On the upper surface (wide surface) of the odd-numbered piezoelectric sheets 21 counted upward from 1 and above, narrow individual electrodes (not shown) are formed for each of the pressure chambers 16 in the cavity plate 10. I have. A common electrode (not shown) common to the plurality of pressure chambers 16 is formed on the upper surface (wide surface) of the piezoelectric sheet 21 of the even-numbered stage from the bottom. On the top surface of the top sheet on the uppermost stage, a surface electrode 30 electrically connected to each of the individual electrodes along an edge portion of a long side thereof, and an electrical connection to the common electrode. A connected surface electrode is provided (see FIG. 10).

The plate-type piezoelectric actuator 20 having such a structure is provided with the cavity plate 1.
0, the individual electrodes of the piezoelectric actuator 20 are stacked and fixed so as to correspond to each of the pressure chambers 16 of the cavity plate 10. Also,
On the upper surface of the piezoelectric actuator 20,
When the flexible flat cable 40 is overlapped and pressed, the flexible flat cable 40
Are electrically connected to the surface electrodes 30 and 31, respectively.

In this configuration, by applying a voltage between any of the individual electrodes of the piezoelectric actuator 20 and the common electrode, it is possible to correspond to the individual electrode of the piezoelectric sheet to which the voltage is applied. Distortion in the stacking direction due to piezoelectricity occurs in the portion, and the internal volume of the pressure chamber 16 corresponding to each of the individual electrodes is reduced by the distortion.
From the nozzle (see FIG. 14), and a predetermined printing is performed.

The number of head units to be arranged in parallel can be arbitrarily set as 2 to 4, and the cavity plate in the head unit may be made of a ceramic material in addition to a metal material. Further, the driving means of the ink jet printer of the present invention may be another type of the above-described plate-shaped piezoelectric actuator 20, or may vibrate a diaphragm covering the back surface of the pressure chamber by static electricity to discharge ink to the nozzle 54. May be used.

The adhesive escape portions 58 and 59 provided in a region where the nozzle plate 43 is bonded and fixed to the front surface of the cavity plate 10 are provided with the cavity plate 1.
In addition to forming a recess in the lower manifold plate 12 at 0, the lower manifold plate 12 and another plate are adhered, and a large number of the adhesive escape portions 58 and 59 are formed in a predetermined area on the surface of the plate. You may.

As still another embodiment, adhesive release portions 58 and 59 may be provided on the back surface side of the nozzle plate 43 (see FIGS. 15A and 15B). In this case, as shown in FIG. 15C, the adhesive escape portions 58 and 59 may be formed so as to penetrate the plate thickness of the nozzle plate 43. In any case, the bonding area of the adhesive 55 is increased, and the bonding strength between the plates is improved by the anchor effect (action). The cross-sectional shape of the adhesive release portions 58 and 59 is not limited to a circle, but may be any other shape such as a square or an ellipse.

It goes without saying that the present invention can be applied not only to an ink jet head but also to a thin plate bonding structure in other electronic parts.

[0048]

As described above, according to the first aspect of the present invention,
In the invention described in the above, a liquid flow path having a small diameter penetrating each thin plate is formed, and the surfaces of at least two thin plates are connected via an adhesive in a state where each liquid flow path communicates between the thin plates. In the adhesive fixing structure of a thin plate-like component that is adhesively fixed, a large number of concave or through-hole adhesive escape portions are formed on the surface of the one thin plate to be bonded and in an outer peripheral region surrounding the liquid flow path. In addition, in the first area close to the liquid flow path in the outer peripheral area surrounding the liquid flow path, the arrangement intervals of the adhesive release portions are made dense, and the bonding distance in the second area outside the first area is reduced. It is characterized in that the arrangement intervals of the agent escape portions are reduced.

According to such a configuration, when the adhesive applied to the area including the first area and the second area is extended by the pressing force applied to the two thin plates, the excess adhesive is left in the adhesive escape portion. Minutes can escape.

Then, the adhesive solidifies after wetting the peripheral wall surface of each of the adhesive release portions, so that the adhesive area of the adhesive increases from the flat surface of the region, and the adhesive becomes Due to the anchor effect (action) of solidifying on the peripheral wall surface of the relief portion (by bonding and hardening with the surface intersecting with the plane of the region), the bonding strength can be increased, and particularly sufficient bonding strength around the fluid flow path can be obtained. This has the effect of preventing fluid leakage.

According to a second aspect of the present invention, in the structure of the first aspect, the thin plate-shaped component has a plurality of nozzles arranged in a row on a front surface thereof. In the head unit plate, the liquid flow path is a nozzle formed in a nozzle plate and an ink flow path formed in a counterpart plate to which the nozzle plate is adhered and fixed.

In this case, by setting the area where the adhesive release portions are arranged close to each other to be a close area surrounding the nozzle row, there is no insufficient sealing due to the adhesive at this area, and the nozzle discharges. This has the effect that the ink can be reliably prevented from entering the inside of the head unit along the gap between the nozzle plate and the surface of the mating member.

[Brief description of the drawings]

FIG. 1 is a perspective view of an ink jet printer head according to an embodiment of the present invention, with the nozzle side facing upward.

FIG. 2 is an exploded perspective view of parts of the ink jet printer head.

FIG. 3 is an exploded perspective view of components of the ink jet printer head as viewed from above a main body frame.

FIG. 4 is a view of a bottom plate of the main body frame as viewed from a lower surface side.

FIG. 5 is a partially cutaway view in which an adhesion area on a lower surface of the head unit is enlarged.

FIG. 6 is an enlarged sectional view of a main part showing an operation of bonding a main body frame, a head unit and a protective cover plate.

FIG. 7 is an enlarged cross-sectional view showing an adhesive portion between the main body frame, the head unit, and the protective cover plate as viewed from the line VII-VII in FIG.

8 is an enlarged cross-sectional view taken along line VIII-VIII in FIG.

FIG. 9 is an enlarged cross-sectional view taken along line IX-IX of FIG. 4;

FIG. 10 is a perspective view of each part of the head unit.

FIG. 11 is a perspective view of each component of the cavity plate.

FIG. 12 is a partially enlarged perspective view of a cavity plate.

13A is an enlarged cross-sectional view of a main part showing a bonding portion of a nozzle plate in a cavity plate, and FIG. 13B is an enlarged cross-sectional view of an adhesive release portion.

FIG. 14 is an enlarged side sectional view of a head unit.

15A is an enlarged cross-sectional view of a main part showing a bonding portion of a nozzle plate in a cavity plate according to another embodiment, FIG. 15B is an enlarged cross-sectional view of an adhesive release portion, and FIG. It is an expanded sectional view of the adhesive release part of a form.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body frame 5 Bottom plate 6 Head unit 7 UV adhesive as 1st adhesive 9a, 9b Injection hole 10 Cavity plate 12, 12 Manifold plate 13 Spacer plate 14 Base plate 17 Through passage 20 Piezoelectric actuator 20 40 Flexible cable 43 Nozzle plate 43a Adhesion area 44 Protective cover plate 54 Nozzle 55 Adhesive 56 Second adhesive 57 Opening window 58, 59 Adhesive escape part 60 Reservoir groove

Claims (2)

[Claims] 1. A liquid passage having a small diameter penetrating through each thin plate is formed, and surfaces of at least two thin plates are bonded to each other with an adhesive in a state where each liquid flow passage communicates between the thin plates. In the bonded and fixed structure of a fixed thin plate-shaped component, a large number of concave or through-hole shaped adhesive escape portions are formed on the surface of the one thin plate to be bonded and in an outer peripheral region surrounding the liquid flow path. In an outer peripheral area surrounding the liquid flow path, in a first area close to the liquid flow path, the arrangement intervals of the adhesive release portions are made dense, and each adhesive in a second area outside the first area is provided. An adhesive fixing structure for a thin plate-shaped component, wherein the arrangement intervals of the escape portions are reduced. 2. The thin plate-shaped part is a head unit plate of an ink jet printer having a plurality of nozzles arranged in a row on a front surface thereof, wherein the liquid flow path includes a nozzle formed in the nozzle plate and a nozzle. 2. The structure according to claim 1, wherein said nozzle plate is an ink flow passage formed in a counterpart plate to which the nozzle plate is bonded and fixed.